I am working with some machines hosted in a HP data center (Littleton Massachusetts), so the choice of HP-UX is not a surprise.
My previous HP-UX experience was version 10 several years ago. It appears little has changed during those years, and freeware support is lacking.
I tried to install a web browser... any web browser. Unlike other OSs, this is not a ten minute task.
Mozilla distributions support Windows, Mac, and Linux x86.
Opera distributions support more OSs - Windows, Mac, Linus, FreeBSD, Solaris, OS2, QNX, and many mobile platforms.
Opera has a distribution for OS2 and not HP-UX.
HP-UX's 3rd party software developers have left the building.